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A177638
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down.
0
1, 70, 25446, 29416791, 83400344760, 492319974701196, 5405431813676888595, 101632942861784833336188
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context: A002829 A177637 A145410 * A274646 A005983 A200313
Adjacent sequences: A177635 A177636 A177637 * A177639 A177640 A177641
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
EXTENSIONS
a(8) from Alois P. Heinz, Nov 02 2013
STATUS
approved

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Last modified October 21 03:03 EDT 2024. Contains 376963 sequences.
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